Chuck.



A. P. KERN.

CHUCK.

APPLICATION FILED AUG. 3. 190B Patented Aug. 3, 1909.

- UNITED STATES PATENT OFFICE.

ALBERT P. KERN, OF CINCINNATI, OHIO, ASSIGNOR TO THE CINCINNATICHUCK COMPANY, OF CINCINNATI, OHIO, A CORPORATION.

CHUCK.

Specification of Letters Patent.

Patented Aug. 3, 1909.

Application filed August s, 1908. Serial No. 446,616.

To all whom it may concern:

Be it known that I, ALBERT P. KERN, a citizen of the United States, residing at Cincinnati, in the county of Hamilton and State of Ohio,-have invented certain new and use ful Improvements in Chucks, of which the following is a specification.

My invention relates to an improvement in chucks for machine tools.

The object of my invention is to provide an im roved mounting for the radially adjustab e jaws at a chuck.

The invention will be understood from the description oi the figures shown in the accompanying drawings, forming a part of this specification, in which Figure 1 is a plan view of the front face of the chuck. Fig-T 2'is an end elevation of one of the jaws and a portion of the body. Fig. 3 is an enlarged section on line :0, 0:, Fig. 1. Fig. {i is a section 'on line '0, '0, Fig. 3. Fig. 5 is a perspective view of one of the bearing sleeves.

1 represents the body of usual construction and having the central axial orifice 2 for receiving the spindle.

3 represents the radial slots having gibways 4 for the sliding jaws.

5 re resents the sliding jaws having gibs 6 radial y adjustable in the slots and gib-ways of the chuck.-

7 represents the half nut formed on the bottom of each sliding jaw for adjustment.

8 re resents the operating screw engaging the ha f nut 7. I desire to provide a suitable bearing for the ends of this operating screw, and for this purpose I provide the bottoms of the radial slots 3 with radial. orifices 9, forming in cross section the segment of a circle greater than a semi-circle in order to contain the bearin sleeve 10 and prevent displacement axial y of the chuck. These sleeves 10 are of hardened steel and are endwise inserted into the orifice. Thereis a sleeve for the inner, and outer ends of the orifices 9. Each sleeve has a flange 1]. engaging against the shoulder 12 of the .body to prevent the sleeve being radially displaced in its critics or seat. Preferably, the outer sleeve has a ortion of its eripher cut away for provi ing clearance f dr the sliding jaw. The ends of the screws are thus given a hard steel bearing in the radial slot, so that the greatest possible efiiciency may be derived.

' Having described my invention, I claim 1. A chuck formed with a radial slot, a jaw having a sliding connection with the walls of the slot, an adjustable screw placed in the slot and engaging the jaw, and a hardened sleeve formed with a cutaway portion on its upper periphery, said sleeve being laced in the end of the slot and forming a caring for one end of the screw, the cutawa portion of the sleeve being positioned to a low the jaw to move clear to the end of the slot.

2. A chuck formed'with a radial slot, the bottom Wall thereof being cutaway at one end to form a segmental orifice greater in cross-section thana semi-circle, and forming a shoulder at the-inner end of the orifice, a jaw slid ably engaging the walls of said slot, a screw in said slot engaging said jaw a sleevehaving a flange at the inner end, said sleeve being endwise removably-inserted'in said segmental orifice and forming a hearing for one end of said screw.

3. A chuck formed with a radial slothaving an orifice at its outer end, greater in cross section than a semicircle, there being a shoulder formed at the inner end of the orifice, a hardened sleeve bearing in said orifice formed with a flange at its inner end engaging said shoulder and havlng a portion of its upper periphery cut away, screw in the slot havin one end bearing in the sleeve, and a jaw slidably engaging the walls of the slot and ada ted to move over the cut-away portion of t e sleeve.

testimony whereof, I have hereunto set my hand.

ALBERT P KEQIL'.

an adjusting 

